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TESTING THE STEAM BOILER THERMAL FUSE AND ELEMENT THE EASY WAY ON A BES 920/980 OR 990

Warning! I am assuming you are qualified to service electrical equipment as you are potentially exposing yourself to voltages that can kill. Please see my article on ELECTRICAL SAFETY. And please abide by all regulations that pertain to electrical safety and appliance servicing for your State or Jurisdiction.

Often with issues relating to the steam boiler, it’s essential to get a resistance reading in ohms to determine if you have an issue with either the thermal fuse or the element itself. Nobody wants to pull the steam boiler out unless they have too, so the easy way is to connected in parallel via the live brown wire and the neutral blue wire. If the thermal fuse and element are okay you should get a reading of around 45 ohms. See the pictures below.

The brown wire is the wire carrying voltage from the Triacs to the steam boiler. If you are colour blind like me, you can physically trace it to the steam boiler.
If you get a high mega ohm reading or infinity e.g. An open circuit then either your fuse or your element is open circuit. In this case you are going to have to remove the steam boiler and determine which component is at fault.
Remember you are obtaining a resistance reading, you do not need the machine turned on. Unplug it, if you didn’t already know this please don’t attempt this at home.

4 Responses to “TESTING THE STEAM BOILER THERMAL FUSE AND ELEMENT THE EASY WAY ON A BES 920/980 OR 990

  • Thank you very much for all of your information on the BES920.

    Until recently our coffee machine was limping along ok, although with a faulty triac that would cause the machine to run the boiler in standby. So we were diligently turning the machine off at the power point, until the replacement triac arrived. (Un)fortunately, before I could replace it, the steam boiler stopped boiling (and I smelt a brief electrical burning smell).

    I’ve done the element and fuse test and measured only 7 ohms. Would this be an indication that the element or fuse has given up, or could i still be related to the faulty triac?

    Appreciate any thoughts or insights you could share.

    Tim

    • sounds like the thermal fuse has done its job on the boiler?, you will need to replace it.

  • Hello – currently facing issues with my BES980 not getting to temperature. I have gotten the error code 19, relating to the grouphead.

    I checked using the above method and got a figure of 280 ohms on the grouphead wire. Does this sound correct?

    • Please note, I purchased the machine as faulty, replaced the o-rings, triacs / octocouplers and when I went to operate the machine, it stopped getting to temperature. Be aware, the machine used to get to temp before this, only had issues after a descale and triac board repair.

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